Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun lumen

2 senses of lumen

Sense 1
lumen, lm -- (a unit of luminous flux equal to the amount of light given out through a solid angle of 1 steradian by a point source of 1 candela intensity radiating uniformly in all directions)
       => luminous flux unit -- (a measure of luminous flux per unit area)

Sense 2
lumen -- (a cavity or passage in a tubular organ; "the lumen of the intestine")
       => cavity, bodily cavity, cavum -- ((anatomy) a natural hollow or sinus within the body)